diff mbox series

[v2,02/23] arm64: allow pte_offset_map() to fail

Message ID 35e46485-8499-4337-c51f-b8fa495a1a93@google.com (mailing list archive)
State New, archived
Headers show
Series arch: allow pte_offset_map[_lock]() to fail | expand

Commit Message

Hugh Dickins June 8, 2023, 7:11 p.m. UTC 
In rare transient cases, not yet made possible, pte_offset_map() and
pte_offset_map_lock() may not find a page table: handle appropriately.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/mm/fault.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index cb21ccd7940d..f3aaba853547 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -177,6 +177,9 @@  static void show_pte(unsigned long addr)
 			break;
 
 		ptep = pte_offset_map(pmdp, addr);
+		if (!ptep)
+			break;
+
 		pte = READ_ONCE(*ptep);
 		pr_cont(", pte=%016llx", pte_val(pte));
 		pte_unmap(ptep);